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Degraded pool

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codad
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Degraded pool

Post by codad »

Hello all... I have spent many weeks trying to figure out why the performance of my nas4free server (NAS4Free 9.0.0.1 (188)) is so very laggy when browsing shares from any of my Windows 7 machines, and was then thrown the following curveball over the weekend: my zfs pool is now degraded:

Code: Select all

pool: vd01
 state: DEGRADED
status: One or more devices are faulted in response to persistent errors.
	Sufficient replicas exist for the pool to continue functioning in a
	degraded state.
action: Replace the faulted device, or use 'zpool clear' to mark the device
	repaired.
 scan: scrub repaired 0 in 4h44m with 0 errors on Tue Nov  6 22:07:50 2012
config:

	NAME        STATE     READ WRITE CKSUM
	vd01        DEGRADED     0     0     0
	  raidz2-0  DEGRADED     0     0     0
	    da0     ONLINE       0     0     0
	    da1     FAULTED      6    59     0  too many errors
	    da2     ONLINE       0     0     0
	    da3     ONLINE       0     0     0
	    da4     ONLINE       0     0     0
	    da5     ONLINE       0     0     0
	    da6     ONLINE       0     0     0

errors: No known data errors
Now, I want to make clear that the degraded status appeared long after I tried figuring out why all my Win 7 machines browse the shares so slowly, and mention it only because I am wide open to considering fixes here (and maybe someone will notice why the win7 issue has been there... or likely not)

Here is my zfs setup as seen in Configuration - Detected

Code: Select all

Pools (1)
Name	Size	Used	Free	Dedup	Health	Mount point	AltRoot
vd01	12.6T	181G (1%)	8.66T	1.00x	DEGRADED		-

Virtual devices (1)
Name	Type	Pool	Devices
vd01_raidz2_0	raidz2	vd01	/dev/da0, /dev/da1, /dev/da2, /dev/da3, /dev/da4, /dev/da5, /dev/da6
When I check the Status - Disks everything seems ok EXCEPT that there is no temp reading off the disk supporting da1 (seems odd)

Code: Select all

Disk	Size	Description	Device model	Serial number	File system	I/O statistics	Temperature	Status
da0	1907730MB	WDC WD2001FASS-00U0B R001 	n/a 	n/a 	ZFS storage pool device 	1.67 KiB/t, 3 tps, 0.00 MiB/s 	30 °C 	ONLINE 
da1	1907730MB	WDC WD2001FASS-00U0B R001 	n/a 	n/a 	ZFS storage pool device 	1.46 KiB/t, 3 tps, 0.00 MiB/s 	n/a 	ONLINE 
da2	1907730MB	WDC WD2003FYYS-02W0B R001 	n/a 	n/a 	ZFS storage pool device 	1.67 KiB/t, 3 tps, 0.00 MiB/s 	30 °C 	ONLINE 
da3	1907730MB	WDC WD2001FASS-00U0B R001 	n/a 	n/a 	ZFS storage pool device 	1.70 KiB/t, 3 tps, 0.01 MiB/s 	30 °C 	ONLINE 
da4	1907730MB	WDC WD2001FASS-00U0B R001 	n/a 	n/a 	ZFS storage pool device 	1.70 KiB/t, 3 tps, 0.01 MiB/s 	30 °C 	ONLINE 
da5	1907730MB	WDC WD2001FASS-00U0B R001 	n/a 	n/a 	ZFS storage pool device 	1.70 KiB/t, 3 tps, 0.01 MiB/s 	30 °C 	ONLINE 
da6	1907730MB	WDC WD2001FASS-00U0B R001 	n/a 	n/a 	ZFS storage pool device 	1.70 KiB/t, 3 tps, 0.01 MiB/s 	30 °C 	ONLINE 
da7	1907730MB	WDC WD2001FASS-00U0B R001 	n/a 	n/a 	ZFS storage pool device 	21.46 KiB/t, 0 tps, 0.00 MiB/s 	30 °C 	ONLINE
And I have the following from Pools - Virtual Device

Code: Select all

Name	Type	Description	
vd01_raidz2_0	raidz2	 	   
vdHS	spare
Hopefully I set that up correctly, and I can now use the vdHS spare drive to simply replace the faulted da1? Or, should I go through a different process to try to resolve this degraded pool?

EDIT1: please be very specific with any recommendations / procedure you would suggest I follow.
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raulfg3
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Re: Degraded pool

Post by raulfg3 »

please post SMART info of degraded/faulting Disk (da1)
12.1.0.4 - Ingva (revision 7743) on SUPERMICRO X8SIL-F 8GB of ECC RAM, 11x3TB disk in 1 vdev = Vpool = 32TB Raw size , so 29TB usable size (I Have other NAS as Backup)

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codad
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Re: Degraded pool

Post by codad »

Here is the SMART info - not sure about the error on da1 for SMART access, but will check into that

Code: Select all

Device /dev/da0 - WDC WD2001FASS-00U0B R001
Vendor:               WDC
Product:              WD2001FASS-00U0B
Revision:             R001
User Capacity:        2,000,398,934,016 bytes [2.00 TB]
Logical block size:   512 bytes
Logical Unit id:      0x001b4d2010830404
Serial number:        WD-WMAUR0138404
Device type:          disk
Transport protocol:   Fibre channel (FCP-2)
Local Time is:        Tue Feb 12 08:01:39 2013 MST
Device supports SMART and is Enabled
Temperature Warning Disabled or Not Supported
SMART Health Status: OK

Current Drive Temperature:     30 C
Drive Trip Temperature:        25 C
Manufactured in week 30 of year 2002
Specified cycle count over device lifetime:  4278190080
Accumulated start-stop cycles:  256
Elements in grown defect list: 0

Error counter log:
           Errors Corrected by           Total   Correction     Gigabytes    Total
               ECC          rereads/    errors   algorithm      processed    uncorrected
           fast | delayed   rewrites  corrected  invocations   [10^9 bytes]  errors
read:          0        0         0         0          0          0.000           0
write:         0        0         0         0          0          0.000           0

Non-medium error count:        0
Device does not support Self Test logging
Device /dev/da1 - WDC WD2001FASS-00U0B R001
Vendor:               WDC
Product:              WD2001FASS-00U0B
Revision:             R001
>> Terminate command early due to bad response to IEC mode page
A mandatory SMART command failed: exiting. To continue, add one or more '-T permissive' options.
Device /dev/da2 - WDC WD2003FYYS-02W0B R001
Vendor:               WDC
Product:              WD2003FYYS-02W0B
Revision:             R001
User Capacity:        2,000,398,934,016 bytes [2.00 TB]
Logical block size:   512 bytes
Logical Unit id:      0x001b4d2094003609
Serial number:        WD-WMAY04900639
Device type:          disk
Transport protocol:   Fibre channel (FCP-2)
Local Time is:        Tue Feb 12 08:01:39 2013 MST
Device supports SMART and is Enabled
Temperature Warning Disabled or Not Supported
SMART Health Status: OK

Current Drive Temperature:     30 C
Drive Trip Temperature:        25 C
Manufactured in week 30 of year 2002
Specified cycle count over device lifetime:  4278190080
Accumulated start-stop cycles:  256
Elements in grown defect list: 0

Error counter log:
           Errors Corrected by           Total   Correction     Gigabytes    Total
               ECC          rereads/    errors   algorithm      processed    uncorrected
           fast | delayed   rewrites  corrected  invocations   [10^9 bytes]  errors
read:          0        0         0         0          0          0.000           0
write:         0        0         0         0          0          0.000           0

Non-medium error count:        0
Device does not support Self Test logging
Device /dev/da3 - WDC WD2001FASS-00U0B R001
Vendor:               WDC
Product:              WD2001FASS-00U0B
Revision:             R001
User Capacity:        2,000,398,934,016 bytes [2.00 TB]
Logical block size:   512 bytes
Logical Unit id:      0x001b4d2010837008
Serial number:        WD-WMAUR0138078
Device type:          disk
Transport protocol:   Fibre channel (FCP-2)
Local Time is:        Tue Feb 12 08:01:39 2013 MST
Device supports SMART and is Enabled
Temperature Warning Disabled or Not Supported
SMART Health Status: OK

Current Drive Temperature:     30 C
Drive Trip Temperature:        25 C
Manufactured in week 30 of year 2002
Specified cycle count over device lifetime:  4278190080
Accumulated start-stop cycles:  256
Elements in grown defect list: 0

Error counter log:
           Errors Corrected by           Total   Correction     Gigabytes    Total
               ECC          rereads/    errors   algorithm      processed    uncorrected
           fast | delayed   rewrites  corrected  invocations   [10^9 bytes]  errors
read:          0        0         0         0          0          0.000           0
write:         0        0         0         0          0          0.000           0

Non-medium error count:        0
Device does not support Self Test logging
Device /dev/da4 - WDC WD2001FASS-00U0B R001
Vendor:               WDC
Product:              WD2001FASS-00U0B
Revision:             R001
User Capacity:        2,000,398,934,016 bytes [2.00 TB]
Logical block size:   512 bytes
Logical Unit id:      0x001b4d2010140101
Serial number:        WD-WMAUR0141101
Device type:          disk
Transport protocol:   Fibre channel (FCP-2)
Local Time is:        Tue Feb 12 08:01:39 2013 MST
Device supports SMART and is Enabled
Temperature Warning Disabled or Not Supported
SMART Health Status: OK

Current Drive Temperature:     30 C
Drive Trip Temperature:        25 C
Manufactured in week 30 of year 2002
Specified cycle count over device lifetime:  4278190080
Accumulated start-stop cycles:  256
Elements in grown defect list: 0

Error counter log:
           Errors Corrected by           Total   Correction     Gigabytes    Total
               ECC          rereads/    errors   algorithm      processed    uncorrected
           fast | delayed   rewrites  corrected  invocations   [10^9 bytes]  errors
read:          0        0         0         0          0          0.000           0
write:         0        0         0         0          0          0.000           0

Non-medium error count:        0
Device does not support Self Test logging
Device /dev/da5 - WDC WD2001FASS-00U0B R001
Vendor:               WDC
Product:              WD2001FASS-00U0B
Revision:             R001
User Capacity:        2,000,398,934,016 bytes [2.00 TB]
Logical block size:   512 bytes
Logical Unit id:      0x001b4d2010147109
Serial number:        WD-WMAUR0141179
Device type:          disk
Transport protocol:   Fibre channel (FCP-2)
Local Time is:        Tue Feb 12 08:01:39 2013 MST
Device supports SMART and is Enabled
Temperature Warning Disabled or Not Supported
SMART Health Status: OK

Current Drive Temperature:     30 C
Drive Trip Temperature:        25 C
Manufactured in week 30 of year 2002
Specified cycle count over device lifetime:  4278190080
Accumulated start-stop cycles:  256
Elements in grown defect list: 0

Error counter log:
           Errors Corrected by           Total   Correction     Gigabytes    Total
               ECC          rereads/    errors   algorithm      processed    uncorrected
           fast | delayed   rewrites  corrected  invocations   [10^9 bytes]  errors
read:          0        0         0         0          0          0.000           0
write:         0        0         0         0          0          0.000           0

Non-medium error count:        0
Device does not support Self Test logging
Device /dev/da6 - WDC WD2001FASS-00U0B R001
Vendor:               WDC
Product:              WD2001FASS-00U0B
Revision:             R001
User Capacity:        2,000,398,934,016 bytes [2.00 TB]
Logical block size:   512 bytes
Logical Unit id:      0x001b4d2010140003
Serial number:        WD-WMAUR0141003
Device type:          disk
Transport protocol:   Fibre channel (FCP-2)
Local Time is:        Tue Feb 12 08:01:39 2013 MST
Device supports SMART and is Enabled
Temperature Warning Disabled or Not Supported
SMART Health Status: OK

Current Drive Temperature:     30 C
Drive Trip Temperature:        25 C
Manufactured in week 30 of year 2002
Specified cycle count over device lifetime:  4278190080
Accumulated start-stop cycles:  256
Elements in grown defect list: 0

Error counter log:
           Errors Corrected by           Total   Correction     Gigabytes    Total
               ECC          rereads/    errors   algorithm      processed    uncorrected
           fast | delayed   rewrites  corrected  invocations   [10^9 bytes]  errors
read:          0        0         0         0          0          0.000           0
write:         0        0         0         0          0          0.000           0

Non-medium error count:        0
Device does not support Self Test logging
Device /dev/da7 - WDC WD2001FASS-00U0B R001
Vendor:               WDC
Product:              WD2001FASS-00U0B
Revision:             R001
User Capacity:        2,000,398,934,016 bytes [2.00 TB]
Logical block size:   512 bytes
Logical Unit id:      0x001b4d2010041606
Serial number:        WD-WMAUR0140616
Device type:          disk
Transport protocol:   Fibre channel (FCP-2)
Local Time is:        Tue Feb 12 08:01:39 2013 MST
Device supports SMART and is Enabled
Temperature Warning Disabled or Not Supported
SMART Health Status: OK

Current Drive Temperature:     30 C
Drive Trip Temperature:        25 C
Manufactured in week 30 of year 2002
Specified cycle count over device lifetime:  4278190080
Accumulated start-stop cycles:  256
Elements in grown defect list: 0

Error counter log:
           Errors Corrected by           Total   Correction     Gigabytes    Total
               ECC          rereads/    errors   algorithm      processed    uncorrected
           fast | delayed   rewrites  corrected  invocations   [10^9 bytes]  errors
read:          0        0         0         0          0          0.000           0
write:         0        0         0         0          0          0.000           0

Non-medium error count:        0
Device does not support Self Test logging
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codad
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Re: Degraded pool

Post by codad »

I just did a simple reboot of the machine, and now the following appears on the pools - information display

Code: Select all

Pool information and status
  pool: vd01
 state: DEGRADED
status: One or more devices could not be opened.  Sufficient replicas exist for
	the pool to continue functioning in a degraded state.
action: Attach the missing device and online it using 'zpool online'.
   see: http://www.sun.com/msg/ZFS-8000-2Q
 scan: scrub repaired 0 in 4h44m with 0 errors on Tue Nov  6 22:07:50 2012
config:

	NAME                     STATE     READ WRITE CKSUM
	vd01                     DEGRADED     0     0     0
	  raidz2-0               DEGRADED     0     0     0
	    da0                  ONLINE       0     0     0
	    3330440466880052133  UNAVAIL      0     0     0  was /dev/da1
	    da1                  ONLINE       0     0     0
	    da2                  ONLINE       0     0     0
	    da3                  ONLINE       0     0     0
	    da4                  ONLINE       0     0     0
	    da5                  ONLINE       0     0     0

errors: No known data errors
And the SMART report is as follows (It looks like one of the drives is now simply gone!):

Code: Select all

Device /dev/da0 - WDC WD2001FASS-00U0B R001
Vendor:               WDC
Product:              WD2001FASS-00U0B
Revision:             R001
User Capacity:        2,000,398,934,016 bytes [2.00 TB]
Logical block size:   512 bytes
Logical Unit id:      0x001b4d2010830404
Serial number:        WD-WMAUR0138404
Device type:          disk
Transport protocol:   Fibre channel (FCP-2)
Local Time is:        Tue Feb 12 14:04:50 2013 MST
Device supports SMART and is Enabled
Temperature Warning Disabled or Not Supported
SMART Health Status: OK

Current Drive Temperature:     30 C
Drive Trip Temperature:        25 C
Manufactured in week 30 of year 2002
Specified cycle count over device lifetime:  4278190080
Accumulated start-stop cycles:  256
Elements in grown defect list: 0

Error counter log:
           Errors Corrected by           Total   Correction     Gigabytes    Total
               ECC          rereads/    errors   algorithm      processed    uncorrected
           fast | delayed   rewrites  corrected  invocations   [10^9 bytes]  errors
read:          0        0         0         0          0          0.000           0
write:         0        0         0         0          0          0.000           0

Non-medium error count:        0
Device does not support Self Test logging
Device /dev/da1 - WDC WD2003FYYS-02W0B R001
Vendor:               WDC
Product:              WD2003FYYS-02W0B
Revision:             R001
User Capacity:        2,000,398,934,016 bytes [2.00 TB]
Logical block size:   512 bytes
Logical Unit id:      0x001b4d2094003609
Serial number:        WD-WMAY04900639
Device type:          disk
Transport protocol:   Fibre channel (FCP-2)
Local Time is:        Tue Feb 12 14:04:50 2013 MST
Device supports SMART and is Enabled
Temperature Warning Disabled or Not Supported
SMART Health Status: OK

Current Drive Temperature:     30 C
Drive Trip Temperature:        25 C
Manufactured in week 30 of year 2002
Specified cycle count over device lifetime:  4278190080
Accumulated start-stop cycles:  256
Elements in grown defect list: 0

Error counter log:
           Errors Corrected by           Total   Correction     Gigabytes    Total
               ECC          rereads/    errors   algorithm      processed    uncorrected
           fast | delayed   rewrites  corrected  invocations   [10^9 bytes]  errors
read:          0        0         0         0          0          0.000           0
write:         0        0         0         0          0          0.000           0

Non-medium error count:        0
Device does not support Self Test logging
Device /dev/da2 - WDC WD2001FASS-00U0B R001
Vendor:               WDC
Product:              WD2001FASS-00U0B
Revision:             R001
User Capacity:        2,000,398,934,016 bytes [2.00 TB]
Logical block size:   512 bytes
Logical Unit id:      0x001b4d2010837008
Serial number:        WD-WMAUR0138078
Device type:          disk
Transport protocol:   Fibre channel (FCP-2)
Local Time is:        Tue Feb 12 14:04:50 2013 MST
Device supports SMART and is Enabled
Temperature Warning Disabled or Not Supported
SMART Health Status: OK

Current Drive Temperature:     30 C
Drive Trip Temperature:        25 C
Manufactured in week 30 of year 2002
Specified cycle count over device lifetime:  4278190080
Accumulated start-stop cycles:  256
Elements in grown defect list: 0

Error counter log:
           Errors Corrected by           Total   Correction     Gigabytes    Total
               ECC          rereads/    errors   algorithm      processed    uncorrected
           fast | delayed   rewrites  corrected  invocations   [10^9 bytes]  errors
read:          0        0         0         0          0          0.000           0
write:         0        0         0         0          0          0.000           0

Non-medium error count:        0
Device does not support Self Test logging
Device /dev/da3 - WDC WD2001FASS-00U0B R001
Vendor:               WDC
Product:              WD2001FASS-00U0B
Revision:             R001
User Capacity:        2,000,398,934,016 bytes [2.00 TB]
Logical block size:   512 bytes
Logical Unit id:      0x001b4d2010140101
Serial number:        WD-WMAUR0141101
Device type:          disk
Transport protocol:   Fibre channel (FCP-2)
Local Time is:        Tue Feb 12 14:04:50 2013 MST
Device supports SMART and is Enabled
Temperature Warning Disabled or Not Supported
SMART Health Status: OK

Current Drive Temperature:     30 C
Drive Trip Temperature:        25 C
Manufactured in week 30 of year 2002
Specified cycle count over device lifetime:  4278190080
Accumulated start-stop cycles:  256
Elements in grown defect list: 0

Error counter log:
           Errors Corrected by           Total   Correction     Gigabytes    Total
               ECC          rereads/    errors   algorithm      processed    uncorrected
           fast | delayed   rewrites  corrected  invocations   [10^9 bytes]  errors
read:          0        0         0         0          0          0.000           0
write:         0        0         0         0          0          0.000           0

Non-medium error count:        0
Device does not support Self Test logging
Device /dev/da4 - WDC WD2001FASS-00U0B R001
Vendor:               WDC
Product:              WD2001FASS-00U0B
Revision:             R001
User Capacity:        2,000,398,934,016 bytes [2.00 TB]
Logical block size:   512 bytes
Logical Unit id:      0x001b4d2010147109
Serial number:        WD-WMAUR0141179
Device type:          disk
Transport protocol:   Fibre channel (FCP-2)
Local Time is:        Tue Feb 12 14:04:50 2013 MST
Device supports SMART and is Enabled
Temperature Warning Disabled or Not Supported
SMART Health Status: OK

Current Drive Temperature:     30 C
Drive Trip Temperature:        25 C
Manufactured in week 30 of year 2002
Specified cycle count over device lifetime:  4278190080
Accumulated start-stop cycles:  256
Elements in grown defect list: 0

Error counter log:
           Errors Corrected by           Total   Correction     Gigabytes    Total
               ECC          rereads/    errors   algorithm      processed    uncorrected
           fast | delayed   rewrites  corrected  invocations   [10^9 bytes]  errors
read:          0        0         0         0          0          0.000           0
write:         0        0         0         0          0          0.000           0

Non-medium error count:        0
Device does not support Self Test logging
Device /dev/da5 - WDC WD2001FASS-00U0B R001
Vendor:               WDC
Product:              WD2001FASS-00U0B
Revision:             R001
User Capacity:        2,000,398,934,016 bytes [2.00 TB]
Logical block size:   512 bytes
Logical Unit id:      0x001b4d2010140003
Serial number:        WD-WMAUR0141003
Device type:          disk
Transport protocol:   Fibre channel (FCP-2)
Local Time is:        Tue Feb 12 14:04:50 2013 MST
Device supports SMART and is Enabled
Temperature Warning Disabled or Not Supported
SMART Health Status: OK

Current Drive Temperature:     30 C
Drive Trip Temperature:        25 C
Manufactured in week 30 of year 2002
Specified cycle count over device lifetime:  4278190080
Accumulated start-stop cycles:  256
Elements in grown defect list: 0

Error counter log:
           Errors Corrected by           Total   Correction     Gigabytes    Total
               ECC          rereads/    errors   algorithm      processed    uncorrected
           fast | delayed   rewrites  corrected  invocations   [10^9 bytes]  errors
read:          0        0         0         0          0          0.000           0
write:         0        0         0         0          0          0.000           0

Non-medium error count:        0
Device does not support Self Test logging
Device /dev/da6 - WDC WD2001FASS-00U0B R001
Vendor:               WDC
Product:              WD2001FASS-00U0B
Revision:             R001
User Capacity:        2,000,398,934,016 bytes [2.00 TB]
Logical block size:   512 bytes
Logical Unit id:      0x001b4d2010041606
Serial number:        WD-WMAUR0140616
Device type:          disk
Transport protocol:   Fibre channel (FCP-2)
Local Time is:        Tue Feb 12 14:04:50 2013 MST
Device supports SMART and is Enabled
Temperature Warning Disabled or Not Supported
SMART Health Status: OK

Current Drive Temperature:     30 C
Drive Trip Temperature:        25 C
Manufactured in week 30 of year 2002
Specified cycle count over device lifetime:  4278190080
Accumulated start-stop cycles:  256
Elements in grown defect list: 0

Error counter log:
           Errors Corrected by           Total   Correction     Gigabytes    Total
               ECC          rereads/    errors   algorithm      processed    uncorrected
           fast | delayed   rewrites  corrected  invocations   [10^9 bytes]  errors
read:          0        0         0         0          0          0.000           0
write:         0        0         0         0          0          0.000           0

Non-medium error count:        0
Device does not support Self Test logging
Device /dev/ - Areca RAID controller R001
/dev/: Unable to detect device type
Smartctl: please specify device type with the -d option.

Use smartctl -h to get a usage summary
Device /dev/da7 - Patriot Memory PMAP
/dev/da7: Unknown USB bridge [0x13fe:0x3100 (0x100)]
Smartctl: please specify device type with the -d option.

Use smartctl -h to get a usage summary
Now I am totally confused and uncertain about how to proceed =(
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codad
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Re: Degraded pool

Post by codad »

Anyone know the exact process to replace the drive given what is now reported in the pool info screen? This doesn't seem to gel with one of the walkthroughs I read (since the drive is no longer even listed in the pool... just a series of numbers)
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b0ssman
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Re: Degraded pool

Post by b0ssman »

i would suggest to start going to the shell

http://forums.freebsd.org/showthread.php?t=14097

give some help as to the commands
Nas4Free 11.1.0.4.4517. Supermicro X10SLL-F, 16gb ECC, i3 4130, IBM M1015 with IT firmware. 4x 3tb WD Red, 4x 2TB Samsung F4, both GEOM AES 256 encrypted.
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raulfg3
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Re: Degraded pool

Post by raulfg3 »

better if use wiki: http://wiki.nas4free.org/doku.php?id=faq:0149
12.1.0.4 - Ingva (revision 7743) on SUPERMICRO X8SIL-F 8GB of ECC RAM, 11x3TB disk in 1 vdev = Vpool = 32TB Raw size , so 29TB usable size (I Have other NAS as Backup)

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HP T510
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fsbruva
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Re: Degraded pool

Post by fsbruva »

Ensure you wipe the new disk!

Also - there is another handbook you should be familiar with:
http://docs.oracle.com/cd/E19253-01/819-5461/index.html
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Ouroborus
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Re: Degraded pool

Post by Ouroborus »

Wipe? Why and how?
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ChriZathens
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Re: Degraded pool

Post by ChriZathens »

This wiki article explains why/how:
http://wiki.nas4free.org/doku.php?id=faq:0129
My Nas
  1. Case: Fractal Design Define R2
  2. M/B: Supermicro x9scl-f
  3. CPU: Intel Celeron G1620
  4. RAM: 16GB DDR3 ECC (2 x Kingston KVR1333D3E9S/8G)
  5. PSU: Chieftec 850w 80+ modular
  6. Storage: 8x2TB HDDs in a RaidZ2 array ~ 10.1 TB usable disk space
  7. O/S: XigmaNAS 11.2.0.4.6625 -amd64 embedded
  8. Extra H/W: Dell Perc H310 SAS controller, crosflashed to LSI 9211-8i IT mode, 8GB Innodisk D150SV SATADOM for O/S

Backup Nas: U-NAS NSC-400, Gigabyte MB10-DS4 (4x4TB Seagate Exos disks in RaidZ configuration - 32GB RAM)
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